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BIO NMDCAT Conjugated molecules
nmdcat.online July 3, 2026

100. The presence of a specialized chromoprotein called bacteriorhodopsin in the purple membranes of Halobacterium salinarum allows this organism to generate a proton gradient. The non-protein prosthetic group retinal is covalently bound to a lysine residue via a

A. Peptide bond
B. Schiff base linkage
✓
C. Phosphodiester bridge
D. Glycosidic linkage

📝 Explanation

Retinal links to the opsin protein via a carbon-nitrogen double bond called a Schiff base linkage, which is central to proton-pumping mechanisms.

📖 Additional Information

  • Peptide bond
  • Schiff base linkage
  • Phosphodiester bridge
  • Glycosidic linkage

Retinal links to the opsin protein via a carbon-nitrogen double bond called a Schiff base linkage, which is central to proton-pumping mechanisms.

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